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Just when it looked like Jon Lester was back on track after two wins to close out July, he took a giant leap backward against the Diamondbacks last Friday.

Lester allowed six runs on 11 hits against Arizona in 4 1/3 innings of work. He didn’t factor in the decision, though, as Boston was able to come back despite being down late. Lester’s ERA is now up to 4.52, while his record remains at 10-6.

It won’t get any easier for Lester on Thursday night, as he will have to face a surprising Royals team. Kansas City has gone 8-2 over its last 10 games and currently sits five games out of the last Wild Card spot.

The Royals will send left-hander Bruce Chen to the mound to face Boston on Thursday. Chen began the year in the bullpen, but he has started in each of his last four appearances. He is 1-0 with a 1.50 ERA over those four starts, and 4-0 overall.

Chen will face a very different Boston lineup than usual on Thursday, as David Ortiz will start the night on the bench. Jonny Gomes will hit in Ortiz’s usual cleanup spot, while Mike Napoli will take over the designated hitter duties. Stephen Drew will also be rewarded for his three-run home run in the ninth inning on Wednesday night, which gave the Red Sox a 7-5 win, with a move up to the No. 5 spot in the order. With Napoli at DH, Daniel Nava will get the start at first after missing three games for the birth of his first child.